A photovoltaic-electrolysis system with high solar-to-hydrogen efficiency under practical current densities

doi:10.1126/sciadv.ads0836

機構典藏 > College of Engineering > Graduate Institute & Department of Chemical and Materials Engineering > Journal Article > Item 987654321/127376

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Title:	A photovoltaic-electrolysis system with high solar-to-hydrogen efficiency under practical current densities
Authors:	Zhang, Qingran;Shan, Yihao;Pan, Jian;Kumar, Priyank;Keevers, Mark J;Lasich, John;Kour, Gurpreet;Daiyan, Rahman;Ivan, Perez-Wurf;Thomsen, Lars;Cheong, Soshan;Jiang, Junjie;Wu, Kuang-Hsu;Chiang, Chao-Lung;Grayson, Kristian;Green, Martin A;Amal, Rose;Lu, Xunyu
Date:	2025/02/26
Issue Date:	2025-05-28 12:05:09 (UTC+8)
Publisher:	American Association for the Advancement of Science
Abstract:	The photovoltaic-alkaline water (PV-AW) electrolysis system offers an appealing approach for large-scale green hydrogen generation. However, current PV-AW systems suffer from low solar-to-hydrogen (STH) conversion efficiencies (e.g., <20%) at practical current densities (e.g., >100 mA cm−2), rendering the produced H2 not economical. Here, we designed and developed a highly efficient PV-AW system that mainly consists of a customized, state-of-the-art AW electrolyzer and concentrator photovoltaic (CPV) receiver. The highly efficient anodic oxygen evolving catalyst, consisting of an iron oxide/nickel (oxy)hydroxide (Fe2O3-NiOxHy) composite, enables the customized AW electrolyzer with unprecedented catalytic performance (e.g., 1 A cm−2 at 1.8 V and 0.37 kgH2/m−2 hour−1 at 48 kWh/kgH2). Benefiting from the superior water electrolysis performance, the integrated CPV-AW electrolyzer system reaches a very high STH efficiency of up to 29.1% (refer to 30.3% if the lead resistance losses are excluded) at large current densities, surpassing all previously reported PV-electrolysis systems.
Relation:	Science Advances 11(9)
DOI:	10.1126/sciadv.ads0836
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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